assert 1 & 3 == 1
assert 1 & 2 & 3 == 0
assert 1 | 3 == 3
assert 1 | 2 | 3 == 3
assert 1 ^ 3 == 2
assert 1 ^ 2 ^ 3 == 0
assert (15 & 22) | (1 ^ 9) == 14
